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Duals of algebraic matroids need not be algebraic

Matt Larson, Tuong Le

Source record

Source: arXiv

Published: Sep 2, 2026

arXiv: 2609.02834

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Source abstract

We give an example showing that the dual of an algebraic matroid need not be algebraic. Our example is a matroid of rank 6 on 10 elements which is algebraic in characteristic 2. It is obtained by gluing an algebraic realization of the non-Fano matroid to a realization of the Fano matroid. Its dual is shown not to be algebraic using the Ingleton-Main lemma.

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